US8390655B2 - Active matrix liquid crystal display and method of driving the same and electronic device - Google Patents

Active matrix liquid crystal display and method of driving the same and electronic device Download PDF

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Publication number
US8390655B2
US8390655B2 US12/697,406 US69740610A US8390655B2 US 8390655 B2 US8390655 B2 US 8390655B2 US 69740610 A US69740610 A US 69740610A US 8390655 B2 US8390655 B2 US 8390655B2
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pixel
thin film
film transistor
voltage
line
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US20100214326A1 (en
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Masahiro Yoshiga
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Innolux Corp
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Chimei Innolux Corp
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • G09G3/3659—Control of matrices with row and column drivers using an active matrix the addressing of the pixel involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependant on signal of two data electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0439—Pixel structures
    • G09G2300/0443—Pixel structures with several sub-pixels for the same colour in a pixel, not specifically used to display gradations
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0439—Pixel structures
    • G09G2300/0443—Pixel structures with several sub-pixels for the same colour in a pixel, not specifically used to display gradations
    • G09G2300/0447—Pixel structures with several sub-pixels for the same colour in a pixel, not specifically used to display gradations for multi-domain technique to improve the viewing angle in a liquid crystal display, such as multi-vertical alignment [MVA]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/028—Improving the quality of display appearance by changing the viewing angle properties, e.g. widening the viewing angle, adapting the viewing angle to the view direction

Definitions

  • the invention relates to an active matrix liquid crystal display device, and more particularly to an active matrix liquid crystal display device and a driving method thereof for increasing a visual angle.
  • An active matrix liquid crystal display device is a liquid crystal display device controlling light transmittance of liquid crystal material to display images.
  • FIG. 4 shows a schematic illustrating an active matrix liquid crystal display device.
  • the active matrix liquid crystal display device comprises a liquid crystal display panel 1 with a plurality of pixels disposed in a matrix for displaying images, a gate driver 2 and a source driver 3 both for controlling the driving of the liquid crystal display panel 1 , and a signal processing circuit 4 for receiving an image signal to be displayed and outputting the control signals and display data to the gate driver 2 and the source driver 3 .
  • a plurality of pixel electrodes 40 are disposed in a matrix in rows and columns.
  • a scan signal line 41 (or named a gate line) is used to select the pixels disposed in the same row according to control of the gate driver 2 .
  • a data signal line 42 (or named a drain line) is used to provide the voltages corresponding to data to be displayed to the pixels disposed in the same column according to control of the source driver 3 .
  • a switching on/off device 43 is used to provide the data of the data signal line 42 to a pixel of a liquid crystal unit according to the scan signal, which may be a thin film transistor (TFT).
  • An opposite electrode 44 is used to provide a common voltage for each liquid crystal unit.
  • a liquid crystal unit coupled between the pixel electrode 40 and the opposite electrode 44 is referred to as a pixel.
  • the liquid crystal unit uses the voltages applied to the pixel electrode 40 and the opposite electrode 44 to achieve a shutter function for adjusting light quantity.
  • the pixels are regularly divided into the RGB, and a color image composed of RGB lights is projected when a color filter of the RGB is disposed near to the opposite electrode 44 .
  • a part corresponding to the RGB pixel array is referred to as a sub-pixel.
  • FIG. 5 and FIG. 6 show the gamma curve diagrams between the voltage of the voltage signal and the brightness.
  • the curve indicates a gamma curve which is obtained by viewing the display in front of the liquid crystal panel.
  • the brightness of the pixel for the liquid crystal display depends on the visual angle. So, a gamma curve which is obtained by watching the liquid crystal panel from a side angle is different than an ideal gamma curve in reality, thus displaying an obscure image for a viewer.
  • the method shown in FIG. 5 and FIG. 6 is used to divide each sub-pixel into two parts which separately provide two different voltage signals according to the curve b and curve c, such that the average brightness obtained by viewing the liquid crystal panel from a side angle may form the ideal gamma curve a, thus reducing dependence on the visual angle.
  • the two signals may be the combinations of other signals.
  • each sub-pixel is divided into two parts to provide two different voltage signals, respectively, the source and gate lines must be increased, thus causing decrease in aperture rate for the liquid crystal panel.
  • An active matrix liquid crystal display device and the driving method thereof in which two different gamma voltage signals can be generated for two pixels of a sub-pixel without extra source or gate lines, are provided, thereby increasing a visual angle without decreasing aperture rate for the liquid crystal panel.
  • Each sub-pixel comprises a first pixel, a second pixel, a first thin film transistor coupled between the first pixel and a source line having a gate coupled to a gate line, an electrostatic capacitor coupled between the first pixel and the gate line, and a second thin film transistor and a third thin film transistor connected in series, coupled between the second pixel and a signal line.
  • a gate of the second thin film transistor is coupled to the gate line and a gate of the third thin film transistor is coupled to the source line.
  • the first pixel is controlled to switch on/off by the gate line and the second pixel is controlled to switch on/off by the gate line and the source line, thereby generating the two different gamma signals for the first pixel and the second pixel.
  • the signal line is a common line.
  • one of the two different gamma signals is a black signal or a white signal, and the other different gamma signal is a gray signal.
  • the electrostatic capacitor is used to adjust a drain voltage of the first thin film transistor coupled to the first pixel.
  • An electronic device comprises the active matrix liquid crystal display device according to the invention, wherein the electronic device is a cellular phone, a digital camera, a personal digital assistant (PDA), an automotive displayer, an aviation displayer, a digital photo frame, or a portable DVD displayer.
  • the electronic device is a cellular phone, a digital camera, a personal digital assistant (PDA), an automotive displayer, an aviation displayer, a digital photo frame, or a portable DVD displayer.
  • an exemplary embodiment of a method for driving the active matrix liquid crystal display device according to the invention to obtain a dark color gray scale signal is provided.
  • the gate line is turned on.
  • a voltage of the source line is set to a low voltage level.
  • the voltage of the source line is set from the low voltage level to a high voltage level.
  • a voltage of the signal line is reversed.
  • the voltage of the source line is set from the high voltage level to the low voltage level and a voltage of the second pixel is set to a voltage level that is equal to the reversed voltage of the signal line, so as to obtain a black color display state for the second pixel.
  • the voltage of the source line is set from the low voltage level to the high voltage level and the voltage of the second pixel that has been set is fixed to the voltage level.
  • an exemplary embodiment of a method for driving the active matrix liquid crystal display device according to the invention to obtain a bright color gray scale signal is provided.
  • the gate line is turned on.
  • a voltage of the source line is set to a low voltage level.
  • the voltage of the source line is set from the low voltage level to a high voltage level.
  • a voltage of the signal line is reversed.
  • the voltage of the source line is kept at the high voltage level and a voltage of the second pixel is fixed.
  • the source line is associated with the gate line to control the switching on/off of a single pixel for a sub-pixel to solve the problems in the prior art.
  • the sub-pixel comprises the first pixel and the second pixel.
  • the switching on/off of the first pixel is controlled by the gate line, and the switching on/off of the second pixel is controlled by the gate line and the source line.
  • the first pixel comprises a thin film transistor and an electrostatic capacitor.
  • the second pixel comprises two thin film transistors connected in series. A gate of one of the two thin film transistors is coupled to the gate line, and a gate of the other thin film transistor is coupled to the source line.
  • the active matrix liquid crystal display device generates two different gamma voltage signals for two pixels of a sub-pixel without extra source or gate line, thus increasing a visual angle without decreasing the aperture rate for the liquid crystal panel.
  • FIG. 1 shows a schematic illustrating a sub-pixel in an active matrix liquid crystal display device according to an embodiment of the invention
  • FIG. 2 shows a timing diagram of a method for driving the active matrix liquid crystal display device according to an embodiment of the invention
  • FIG. 3 shows a timing diagram of a method for driving the active matrix liquid crystal display device according to another embodiment of the invention
  • FIG. 4 shows a schematic illustrating an active matrix liquid crystal display device
  • FIG. 5 shows a gamma curve diagram between voltage and brightness
  • FIG. 6 shows another gamma curve diagram between voltage and brightness.
  • FIG. 1 shows a schematic illustrating a circuit of a sub-pixel in an active matrix liquid crystal display device according to an embodiment of the invention.
  • Each sub-pixel comprises a first pixel 11 coupled to a first thin film transistor (TFT) 21 and a second pixel 12 coupled to a second TFT 22 , wherein the first TFT 21 and the second TFT 22 are controlled to switch on/off when a gate line is selected.
  • TFT 21 and the second TFT 22 are controlled to switch on/off when a gate line is selected.
  • Each gate of the first TFT 21 and the second TFT 22 is coupled to a gate line 32 .
  • the second pixel 12 further comprises a third TFT 23 which has a gate coupled to a source line 31 .
  • the third TFT 23 of the second pixel 12 is turned on, and then a white color signal or a black color signal is obtain through the second TFT 22 and a common line 33 that functions as a signal line.
  • a voltage range of the source line 31 is set to a higher than normal state according to a condition that the third TFT 23 can operate normally.
  • the gate line 32 is turned off, a voltage of the first pixel 11 is reduced by an electrostatic capacitor 34 , so as to obtain a satisfactory pixel voltage.
  • the electrostatic capacitor 34 is used to adjust a drain voltage of the first TFT 21 coupled to the first pixel 11 according to the invention.
  • FIG. 2 shows a timing diagram of a method for driving the active matrix liquid crystal display device to obtain a dark color (below 50%) gray scale signal according to an embodiment of the invention.
  • the first TFT 21 and the second TFT 22 are turned on when the gate line 32 is turned on by setting a voltage of the gate line 32 to 15V.
  • the third TFT 23 is turned on by setting a voltage of the source line 31 to 0V (i.e. the source line 31 is turned on) such that a voltage of the second pixel 12 is equal to that of the common line 33 (i.e. 1V).
  • the voltage of the first pixel 11 is equal to that of the source line 31 (i.e. 0V).
  • the third TFT 23 is turned off such that the voltage of the second pixel 12 is fixed at 1V, and the voltage of the first pixel 11 is changed to 9V in response to the voltage of the source line 31 .
  • the voltage of the common line 33 is reversed from 1V to 6V.
  • the voltage of the source line 31 is set to 0V such that the third TFT 23 is turned on and the voltage of the second pixel 12 is equal to that of the common line 33 (i.e. 6V), thereby obtaining a black color display state for the second pixel 12 .
  • the voltage of the first pixel 11 is changed to 0V in response to the voltage of the source line 31 . Therefore, by setting the voltage of the source line 31 to 9V once again, the black color display state is fixed for the second pixel 12 .
  • the first TFT 21 and the second TFT 22 are turned off, thus the voltage of the second pixel 12 is fixed at 6V.
  • the voltage of the first pixel 11 is changed from 9V to 4V due to coupling effect. Therefore, the dark color gray scale signal is generated in the sub-pixel when the first pixel 11 is operated at a voltage of 4V for a gray color display state and the second pixel 12 is operated at a voltage of 6V for a black color display state.
  • FIG. 3 shows a timing diagram illustrating a method for driving the active matrix liquid crystal display device to obtain a bright color (above 50%) gray scale signal.
  • the first TFT 21 and the second TFT 22 are turned on when the gate line 32 is turned on by setting the voltage of the gate line 32 to 15V.
  • the third TFT 23 is turned on by setting the voltage of the source line 31 to 0V (i.e. the source line 31 is turned on) such that the voltage of the second pixel 12 is equal to that of the common line 33 (i.e. 1V).
  • the third TFT 23 is turned off such that the voltage of the second pixel 12 is fixed at 1V.
  • the voltage of the common line 33 is reversed from 1V to 6V.
  • a white color display state is fixed for the second pixel 12 .
  • the first TFT 21 and the second TFT 22 are turned off, thus the voltage of the second pixel 12 is fixed at 1V.
  • the voltage of the first pixel 11 is changed from 9V to 4V due to coupling effect. Therefore, the bright color gray scale signal is generated in the sub-pixel when the first pixel 11 is operated at a voltage of 4V for a gray color display state and the second pixel 12 is operated at a voltage of 1V for a white color display state.
  • the circuit and the driving method thereof may obtain two gamma voltages for a sub-pixel without extra source lines or gate lines.
  • the active matrix liquid crystal display device may be implemented in an electronic device, such as a cellular phone, a digital camera, a personal digital assistant (PDA), an automotive displayer, an aviation displayer, a digital photo frame, or a portable DVD displayer.
  • an electronic device such as a cellular phone, a digital camera, a personal digital assistant (PDA), an automotive displayer, an aviation displayer, a digital photo frame, or a portable DVD displayer.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Liquid Crystal (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
US12/697,406 2009-02-20 2010-02-01 Active matrix liquid crystal display and method of driving the same and electronic device Active 2031-03-03 US8390655B2 (en)

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JP2009-038369 2009-02-20
JP2009038369A JP4735998B2 (ja) 2009-02-20 2009-02-20 アクティブマトリックス液晶表示装置及びその駆動方法
JP2009038369 2009-02-20

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Cited By (1)

* Cited by examiner, † Cited by third party
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US9865189B2 (en) 2015-09-30 2018-01-09 Synaptics Incorporated Display device having power saving glance mode

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CN103513484B (zh) * 2013-06-19 2017-03-01 深圳市华星光电技术有限公司 液晶阵列基板及液晶阵列基板测试方法
KR102204674B1 (ko) * 2014-04-03 2021-01-20 삼성디스플레이 주식회사 표시 장치
CN108646480B (zh) * 2018-04-02 2020-12-29 深圳市华星光电半导体显示技术有限公司 一种垂直取向型液晶显示器
CN112198726A (zh) * 2020-10-30 2021-01-08 Tcl华星光电技术有限公司 多畴垂直配向模式显示面板及其显示装置
CN113219745B (zh) * 2021-04-20 2022-07-05 北海惠科光电技术有限公司 显示面板、显示设备以及显示面板的驱动方法

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JPH096289A (ja) 1995-06-19 1997-01-10 Matsushita Electric Ind Co Ltd 液晶表示装置とこの装置を備えた情報処理装置
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US20010030699A1 (en) * 2000-03-02 2001-10-18 Takamasa Sakuragi Signal processing apparatus
US20040252966A1 (en) * 2003-06-10 2004-12-16 Holloway Marty M. Video storage and playback system and method
US7903068B2 (en) * 2006-07-04 2011-03-08 Hannstar Display Corporation Liquid crystal display and driving method thereof
US20080158745A1 (en) * 2006-12-29 2008-07-03 Shyh-Feng Chen Data transmission circuit with ESD protection and LCD thereof
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JP4735998B2 (ja) 2011-07-27
JP2010191384A (ja) 2010-09-02
US20100214326A1 (en) 2010-08-26
CN101840678B (zh) 2013-08-14
TW201032209A (en) 2010-09-01
CN101840678A (zh) 2010-09-22
TWI413088B (zh) 2013-10-21

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